topology script called with host names instead of IP addresses
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Key: HADOOP-6397
URL: https://issues.apache.org/jira/browse/HADOOP-6397
Project: Hadoop Common
Issue Type: Bug
Components: util
Affects Versions: 0.20.1
Reporter: Christian Kunz
According to the 'Hadoop Rack Awareness' section on
http://hadoop.apache.org/common/docs/r0.20.0/cluster_setup.html the
script/program topology.script.file.name can assume that names are passed in as
IP addresses.
This seems to work for hdfs, but the rack-awareness of the JobTracker does not
always work, depending on the hostnames of the cluster, because of a bug in the
method normalizeHostName of org.apache.hadoop.net.NetUtils.java:
It returns the host name as-is when it decides that the string passed-in is
already an IP but actually it checks whether the string starts with a valid hex
character!
There is no need to check at all, because InetAddress.getByName is smart enough
to not do a dns lookup when the name is an IP address.
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